Electric forge



(No Model.)

. A 3Sheets--Sheet 3. G. D. BURTON 8:; E. E. ANGEL'L.

ELEOTRIG FORGE.

Patented Nov. 15, 1892.

UNITED STATES PATENT OFFICE.

GEORGE D. BURTON, OF BOSTON, AND EDWIN E. ANGELL, OF SOMERVILLE,MASSACHUSETTS, ASSIGNORS TO THE ELECTRICAL FORGING COMPANY,

OF MAINE.

ELECTRIC FORGE.

SPECIFICATION forming part of Letters Patent No. 486,176, dated November15, 1892.

Application filed January 12,1892. Serial No. 417,850- (No model.)

T at whom it may concern:

Be it known that we, GEORGE D. BURTON, residing at Boston, in the countyof Suifolk, and EDWIN E. ANGELL, residing at Somer- Ville, in the countyof Middlesex, State of Massachusetts, citizens of the United States,have invented certain new and useful Improvements in Electric Forges, ofwhich the following is a specification.

This invention relates to an electric forge for heating and softeningbars of metal preparatory to forging, shaping, or tempering them.

The object of this invention is to provide an electric forge having anelectrode adapted to be easily manipulated for graspingand releasing thebars to be heated, and in which the faces of the clamping-jaws areadjustable and interchangeable to suit bars of different shapes andeasily removable when worn out.

Figure 1 of the accompanying drawings represents a front elevation ofthis improved electric forge attached to an electric-cu rrent converter.Fig. 2 represents a plan thereof. Fig. 3 represents alongitudinalsection of one of the clamps of one of the electrodes in closedposition.- Fig. 4 represents a longitudinal section of said clamp inopen position. Fig. 5 represents a transverse section 0 of said clamp.Fig. 6 represents an end elevation of one of the stationary detachablejaws of the electrode-clamp, having a flat face adapted for clamping aflat bar. Fig. 7 represents an end elevation of one of said jaws 3 5provided with a curved groove adapted to receive a bar having a curvedface. Fig. 8 represents one of said stationary detachable jaws providedwith two angular grooves adapted to receive bars which are angular incrosssection.

Similar numerals of reference indicate corresponding parts of thedifferent figures.

A current-converter for transforming an electric current of smallvolume, measured in amperes, and of high tension, measured in volts,into a current of low tension or voltage and large amprage or volume isemployed in connection with this electric forge to furnish theheating-current therefor. The converter which we have used for thispurpose comprises an annular core, preferably composed of differentlengths of uninsulated or partially-insulated heavy wire disposed sideby side and arranged to break joints; primary coils, composed ofcomparatively-fine wire, disposed at intervals around the annulus of thecore and insulated therefrom; secondary coils composed of plates orsheets of copper disposed around said annulus between the primary coilsand insulated therefrom and from the core, and two exterior heavy copperrings surrounding the structure. The primary coils are arranged inpairs, the coils of each pair being connected in series with each otherand in parallel with every other pair and to the terminals of theprimary circuit by binding-posts mounted on a central support. Thesecondary coils are composed of copper plates, and all the positiveterminals thereof are connected with one of the eXterior rings and allthe negative terminals with the other exterior ring, said rings thusconstituting the positive and negative terminals of the converter.

An illustration of the construction of the converter, which is thesubject of other applications for patents, is deemed unnecessary for thepurposes of this case.

Any converter capable of furnishing the required current may be used inconnection with this improved forge.

In the drawings segments of the exterior converter-rings arerepresented. The lower converter-ring 10 may be considered for thepurposes of-this description as the positive terminal, and the upperconverter-ring 20 as the negative terminal, of the converter. The ring10 is provided withaboss 11 and the ring 20 with a boss 21, said bossesbeing disposed apart on the circumference of the converter. A shortbracket 12 is attached to the boss 11 and provided at its outer end witha clamp 13, and a short bracket 22 is attached to the boss 21 of thering 20 and provided with a clamp 23. A vertical conductive rod 14 issupported in and depends from the clamp 13, and a vertical rod 24 issupported in and depends from the clamp 23, said rods being provided,respectively, at their lower ends with horizontal clamps 15 and 25. Ahorizontal arm 16 is adjustable in the clamp 15 and provided at itsouter end witha clamp 17, and a short horizontal arm 26 is adjustable inthe clamp 25. A horizontal arm 18 is sup ported in the clamp 17 andprojects at an angle to the arm 16, being provided at its outer end witha vertical screw-threaded sleeve 19. An electrode 30 is supported in thevertical sleeve 19, and an electrode is attached to or forms a part ofthe arm 26. The electrode 30 consists of a bed 31, provided with ascrew-threaded spindle 30, which fits in the vertical sleeve 19, wherebythe electrode is adjustable vertically. The bed 31 is provided with anumber of sockets 32 and with several pairs of lugs 33. Arms 34 arehinged to said lugs and provided at their free ends with cams 35 andhooks 3G. Forked hand-levers 37 are pivoted to opposite sides of the bedin front of the lugs 33. Detachable jaws 38, composed of copper or otherhighly-conductive material, are disposed on the bed and provided withtangs 39, which extend into the sockets in said bed. The upper faces ofthese jaws are plain, as shown in Fig. 6, or provided with curvedgrooves, as shown in Fig. 7, or provided with V- shaped grooves, asshown in Fig. 8, or otherwise shaped on their face to conform to theshape of the metal to be heated. Screwrods pass through threaded holesin the arms 34, being adjustable thereon. The lower end of each of saidrods is recessed and provided with a nut or flange 51, said end an d nutserving as a movable jaw. Each of the hand-levers 37 is provided with astud 52, which engages the cam 35 and hook 36 of one of the arms 34.When the hand-lever 37 is swung toward the right, said stud 52 ridesinto the cam 35 and serves to depress said arm 34 and bring the movablejaw 51 into operative connection with the fixed jaw 38. When thehand-lever 37 is swung to the left, said stud, as shown in Fig. 3, comesin contact with the inclined cam-face 36 of the hook at the outer end ofsaid arm 34, whereby the arm is lifted and the jaw 51 retracted.

The electrodes and the brackets and arms which serve as conductors forconnecting them with the converter are composed of copper or otherhighly-conductive material.

In the use of this improved electric forge the clamps of the electrode30 are opened by swinging the hand-levers 37 toward the left. The bars100 to be heated are then passed between the jaws 38 and 51 of saidclamps and their inner ends made to enter the sockets 41 of theelectrode 40. The hand-levers 37 are then swung toward the right, andthe seam:

studs thereof engage the cams 35 of the bars 34 and depress said arms,whereby tne movable jaws 51, carried by said arms, are brought intocontact with the bars 100, resting on the stationary detachable jaws 38.The bars 100, spanning the space between the two elec trodes 30 and 40,serve as conductors for the current, and being of higher resistance thanthe electrodes and their connections heat is developed, and in a fewseconds said bars are brought to a forging temperature from their innerextremities resting in the sockets 41 of the electrode 40 to theirpoints of contact with the clamping-jaws of the electrode 30. When theyare sufficiently heated, the handlevers are swung toward the left, andthe studs 52 engage the cam-faces 36 of the hooks of the arms 34 andlift said arms and their movable jaws, whereby the bars 100 arereleased. The bars are then forged by an or dinary hammer and anvil orby a forging-machine, or they may be subjected to a bending or shapingoperation.

we claim as our invention- 1. An electrode for an electric forge,consisting of a base, a fixed jaw supported there on, an arm pivoted tosaid base and provided with a hook at its outer end having a depressingcam-face and a lifting cam-face, a movable jaw supported by said arm,and a lever pivoted to said base and provided with a stud engaging saidcam-faces when the lever is oscillated.

2. In an electric forge, the combination of an adjustable electrodeprovided with sockets for receiving the ends of bars to be heated, anelectrode disposed in a plane with the first electrode and consisting ofa base provided with detachable conductive fixed clamping-jaws, armspivoted to said base and provided with depressing and lifting cam-faces,movable jaws supported in said arms, handlevers pivoted on said base andprovided with studs engaging the hooked arms for clamping or releasingthe jaws, and conductors connecting said electrodes with the source of aheating-current.

3. In an electric forge, the combination of a converter provided withexterior rings constituting the positive and negative poles, anelectrode provided with a socket for receiving the end of a bar to beheated, a conductor connecting said electrode with one of said rings, asecond electrode and a conductor connecting said second electrode withthe other ring, said second electrode being provided with a fixedconductive jaw, a hinged arm provided with a hook at its outer end,

having adepressing and a lifting cam, an adjustable spindle in said armcarrying the movable conductive jaw, and a hand-lever pivoted to saidbase and provided with a stud for engaging said cams.

4. An electrode for an electric forge, comprising a base, a detachableconductive jaw ICC supported in said base, a movable arm, a above setforth we aflix our signatures in presspindle supported therein andprovided with ence of two witnesses. a groove at its lower end and witha nut which serves, in con j unetion with the grooved 5 end of saidspindle, as a conductive elampingjaw, and means for actuating said arm,sub- Witnesses: stantially as set forth. CHAS. F. ADAMS,

In testimony that we claim the invention CHESTER MARR.

